<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			var a = 1;
			console.log('小写的a:' + a);
			console.log('大写的A：' + A);
			//js区分大小写
			//分号可写可不写，一般要写上
		</script>
	</body>
</html>